To a solution of methyl 2-amino-7,7-dimethyl-7,8-dihydro-1H-benzofuro[4,5-d]imidazole-5-carboxylate (1.00 g, 3.81 mmol) in THF (25 mL) was added EDCI.HCl (1.4 g, 7.62 mmol), HOBT (1.00 g, 7.62 mmol), 2-chloro-6-fluorobenzoic acid (1.32 g 7.62 mmol) and TEA (3 mL). The reaction mass was stirred for 18 h. The reaction mass was quenched in water extracted with 10% DCM: methanol. The organic layer was dried over anhydrous sodium sulphate and concentrated. The obtained crude was purified by column chromatography on basic alumina eluting with 0.7% DCM: MeOH to afford 0.700 g of the desired product. 1HNMR (DMSO-d6): δ 1.43 (s, 6H), 3.02 (s, 2H), 3.58 (s, 3H), 6.08 (bs, 1H), 7.59-7.69 (m, 2H), 7.83 (q, J=6.6 Hz, 1H), 8.14 (bs, 2H); MS [M+H]+: 418.05.
